A LOOOOONG time ago Channel Master tuner cleaner was the way to go. You may have to go to eBay for that stuff.
For now , if you can find a Radio Shack that still exists or someone that has any NOS , Radio Shack sold a good tuner cleaner . If you can't find any I will send you some.
There is some cluck on eBay selling a 4.5oz can for $200+shipping . Unless this has a mixture of DMT and STENDA , I don't think it is worth it ?
WD-40 is marketing a tuner cleaner but ..............