Tank Cleaning

[Shogunblue24]

Hi guys. Just a quicky hopefully. Second-hand tank already emptied but needs cleaning. I've given it a good rinse out with a hose, but need to remove some dirty sucker marks. Elbow grease and a scouring sponge pad ain't moving it. Any ideas what's safe to use (for both tank and fish) that'll help remove them?

Thank you muchly in advance, Andy

 

[symon_say]

Try water with some vinegar.

 

[pottsvill]

Make sure you use WHITE vinegar!!