But I see there's more cleaning needed. The fans should be removed and the junk in the fins removed. Then put the fans back on. If you think the fans need a little KAPTON tape (across the top IMO) to improve air flow then do that. That wool looks like accumulated hair to me. Get it out of there.

Example tape (high temp stuff) at https://www.amazon.com/Gold-Kapton-Tape-Polyamide-36yds/dp/B0049KTIAU