Lol I've been scrubbing tube glass with whatever rag is closest like a caveman for years, so this is a nice upgrade. My dumb trick is using the sticky side of a lint roller on the vents when I'm too lazy to pull the back off. Learned that after I blew a puff of air into a set and a dust cloud came right back out at my face. The coffee filter thing makes sense though, less lint and no scratchy edges. Gonna raid my kitchen for a box before my next pickup.

Ever try a guitar pick as a screwdriver and never look back?

Was it really too much water, or just a wet mix?