86-87 Fleer Sticker Question

I bought a Magic Johnson PSA 9 (ST) at an auction last year and it is a headscratcher to me what they would call a stain (sorry I don't have a scan). I've noticed this on another auction on ebay with the same card. Are these cards very stain prone (if that's a word)? The Fleer experts your knowledge would be really appreciated.
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But yes, every 86 Fleer sticker is on the back of the wax pack, therefore getting a wax stain. About 10 years ago, I tried subbing some really sharp and nicely centered 86 Fleer stickers after I had tried removing the stains. I used a clothesdryer sheet, and thought the cards looked pretty good.
I subbed 8 stickers, got 6 8's and 2 9 (ST).
All my 9 NQ stickers were purchased already slabbed.
Good luck