Preferred Contact Cleaner and Contact Enhancer for Audio?


I have been doing some research on the topic of contact enhancers. I've used the Stabilant 22A contact enhancer. I understand other options occur in this space, such as the Furutech Nano Liquid, the Mad Scientist Audio graphene contact enhancer, and Cardas Contact Conditioner (to name a few). Any one having experience with any of these (or others not mentioned)? And what about contact cleaners? Are any contact cleaner worth considering (beyond 70% isopropyl alcohol)?
128x128celander
Even if it’s just isopropyl alcohol, be sure and clean all electrical contacts, including non audio contacts, e.g., fridge, other appliances, lamps.
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Now 1002 times. I’m not asking for input about virtues and faults of any given cleaner or enhancer that would precipitate a verbal food fight.

Consider this thread more as a poll than the past 1001 threads. 

Thank you. 
I had been using Kontak for 25 years with good result.

It make sound more transparent and detailed.

Most important thing is that it does not give any residue after cleaning.

https://www.musicdirect.com/equipment/kontak-contact-cleaner-aluminum-bottle

If you close the bottle carefully, you can keep using it over one year.