KONTAK CLEANER


My bottle of Kontak cleaner just came today. I have read alot of good reviews about it but none say how to use or apply it. Can anyone that uses it can tell me how to apply it ? 
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" Easy to use, simply apply and allow to dry. Once Kontak has been applied, contact resistance between the connectors drops to virtually nothing, enhancing signal flow and conductivity."

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

"  Also can i use it to clean my electric posts on my amp , preamp and cdp?"

isnt that what you bought it for ???
I have used it and used plain white paper towel to wipe the items until things were clean. 
I “did not” simply apply the cleaner and let it dry ...(coat the dirt?)
Try it and see the tarnish come off.