Rear wiper motor seized

I have a Toyota corolla 1999 year but hope someone can give me some advice on this. Recently my rear wiper motor started moving slow until the other day it would not work whatsoever. I have looked for a replacement and cant find one and the dealer wants £246 (bloody outrageous price)

So I decided to remove and take apart after testing that there was voltage at the plug and on disassembly found that the grease inside had turned to thick paste, so I cleaned it all out with carb cleaner and re greased all over very generously and re-fit and it now works fine apart from now it squeaks quite loud after the first few screen wipes, the first few wipes are quite its just after it has wiped the screen 2 or 3 times it squeaks.

Could this be due to me using carb cleaner to thoroughly clean the unit and its just wait and see if it works in over time or should I pack it with even more grease.

I am just pleased I got it going again. Thanks.