guitar output jack?

[metalboy458]

ive been getting a dirty sounding signal, so i got new cables today (mogami). it cleaned it up alot and sounds clearer but theres still a little dirt in the signal. my guitar is a epiphone korina explorer. should i replace the output jack? or just clean it out?

if i should replace it then any advice on what kind and where i should get it?

thanks in advance