Kelvin, they sell them in those pound shops so check there first. The ones I got were from Poundland I think, they're call Zam Sponge Erasers. Apparently they "Works like Magic!". If you can't find any I can send you a bit in the post.
Scotchbrite is something else entirely, being fibrous and abrasive in various grades. Do not use it on your stylus. What I've seen: Black: very coarse abrasive, used to clean BBQ grills. Red: coarse abrasive Green: medium, can be used to give a fine brushed finish to aluminium or steel, like platter edges Blue: Not used personally, but I think it goes here: fine White: plastic, suitable for use on anti-stick cookware
You got the "Scotch-Brite" family right except for a couple you may not know about. Black: Ultra coarse about equal to 36 or 40 grade sandpaper.strips paint off houses, grinds down welds. Brown: very coarse used for stripping floors of old wax. Dark blue (looks black): BBQ grill cleaner about 80 grade sandpaper. Rust colored: cleans glazed tile and such, about 100 grit. Yellow finer than medium blue, coarser than white. Restaurant kitchen dish scrubber, rarely found elsewhere. I cheated: I have the whole set of Scotch-Brite Pads for refinishing. There's also a pink super-super fine for polishing things with a high-speed buffer. Bowling supplies polish bowling balls with them. American Airlines' Maintainence Center polishes their aircraft with these to the mirror-finish before they clear-coat them har' in Tussa. The Mexican supermarket has a non-soap version of Mr. Clean "Magic Eraser", because the dish detergent they sell will already strip latex paint. The Mexican Indians here use lard for most of their cooking. Tastes good (like French pastries) but it's hard to clean up after.