Cleaning audio components with 90% isopropyl alcohol

You can buy 99%pure On Amazon less impurities 

I use99% pure from Amazon  then put a thin coat of  Stabilant which is a contact enhancer , NASA has been using this fr years ,my uncle is a master technician turned me on to this years ago if you don’t move cables around often this will keep cables from oxydation for over 12 years verywell proven can also buy on Amazon 

I buy the concentrate a little bottle last for years.

https://stabilant.com/NoteList.html#reviews

I just use a microfiber cloth

I just spit on them and wipe clean with 10ply toilet paper. I find it really enhances the sound. 

You really should get some CRC +1 @toddsyr if you can or Deoxit D5, for contacts and pots and the green F5 for faders plastics etc.