Hi, I bough the Glass Cleaner Tool Set. It comes with a metal blade to scrape off algae from a glass tank. Will a metal blade scratches the glass?
It can scratch the glass if used improperly, but otherwise it won't be a problem.
Well I dug one up from the garage the other day which my dad used when he was a kid.
I've used it once so far and it works great, no scratches I presume it comes on a stick? Does it have a rotatable head? If no to either of these then you need to be careful not to catch the sharp blade corners on yourself or the glass but apart from that you're good!