I've remember the divider from a duo tank and I've managed to removed the bulk of the silicone from the glass but can't get rid of the last smeary bits. I don't want to persevere with a razor as I've already managed to scratch the glass a bit which you can see in the picture. It's inside the tank so I don't want to use harsh chemicals.
Any help would be appreciated and also if anyone knows how to remove the scratches at home too without spending lots of money!