plexi and algae

[debbie]

What is the best way to remove the hard algae on plexi glass without scratching it??
Also will a toothbrush to use on the sides of the plexi glass to keep it clean scratch it??

 

[wangotango]

Try using a credit card.
-Justin

 

[joncat24]

An old credit card always worked for me.
Seems like acrylic scratches if you look at it wrong for me though...LOL