Help with used records.

Actually nose OIL and behind the ear Grease are used a lot in sharpening fine tools by old craftsmen. And for some it is just self amusement:) Put a little on your dogs nose and watch him go nuts.

Is that like.. "putting a nose to the grindstone"??

"Thrift store" meaning Goodwill? Goodwill stickers are the original 'stickers from Hell'. I used to go to Goodwill, but just never bother to anymore. The Goodwill stickers are indeed the most remove proof i have ever encountered.
For those, free tricks do not work.
"Goo Gone" commercial product is your friend for Goodwill stickers.
(And thank the folks who chimed in on 'nose oil' and it's uses...)

Acetone & 100% isopropyl alcohol work equally well. Only problem is that it also can (likely will in my experience) remove the printers ink along with the adhesive residue. Caveat utilitor.

As long as we are on cleaning off LP covers... I use Meguairs Scratch X on a bit of VIVA paper towel to clean off the cardboard covers. The product removes the dirt really well. I use a very small daub and first rub it into the Viva with my finger, THEN rub the cover lightly all oover, movingto a different spot on the Viva as soon as it gets a bit dirty. I can remove most of the ringwear that is just dirt this way.

Works the very best on glossy covers, which it can even restore scratched in ring wear marks to some extent. For waxed covers still works, but may start taking the print off. (Usually a modicum of ink will come off with the first swipes, but that is just loose stuff, and the cover will look way better and the cover's color will 'pop' more after cleaning. But too much and the color WILL be removed, so it is a two edged sword.

Do NOT use that for soft porous paper. I use packing tape for those BUT that is very dangerous!! I take the tape and place the sticky part on my arm to diminish the sticky power of the tape first. Them slide the tape gently with no stopping!! sticky side down across the surface pressing with my fingers on the tape gently. The tape picks up the surface dirt and can clean a soft porous cover pretty well. The danger is if your press too hard, or stop moving the tape smoothly, the tape WILL tear the paper!! So practice this on some junk covers before doing it to a good cover that you want cleaner.