I found on this site that if you have any lime build up you can always use a bit of vinegar to clean it up and then rinse the bowl really well.
How to clean a wall mounted fish bowl.
Always thoroughly rinse the vinegar in room temperature water after the fish bowl is clean.
Spritz a dust cloth with a small amount of dusting spray.
It turns out the residue can be harmful to the fish.
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In addition it doesn t have a lid to prevent the fish from jumping out.
Clean your mounted fish gently to ensure that it remains in good condition.
The photos of colorful fish in a bowl on the wall are enticing but after test driving one this bowl is not an ideal home for live fish.
If water and elbow grease alone won t remove the gunk on the fish bowl wet a cloth with white vinegar and scrub the sides.
Scrub the fish bowl with vinegar if necessary.
Take the mounted fish off of the wall being careful not to bump the delicate fins against anything.
So i did some research and the best way to clean out the bowl is to rinse it out and just wipe it down with wet paper towels.