You can remove most, if not all, your markings like date, type of flies, etc. that you've written with permanent marker on your ff culture cups and lids with Windex, in order to re-use them again without confusion. Just spray on, let sit about 1 minute, and wipe off with paper towel. You may have to rub and repeat, but it usually comes off pretty easily. I wash in dish soap and warm water afterwards, rinsing well.
I've started using little "Post It" type Flags now instead of marker, because it does take time and is just "one more thing" to do. But it is possible on those ones you've already marked. Some generic window cleaners work, but not some others... Windex works. I'm thinking it might be the ammonia in it, but haven't tried straight ammonia to check the theory.
Edit: I've tried straight ammonia, and it works too.
I've started using little "Post It" type Flags now instead of marker, because it does take time and is just "one more thing" to do. But it is possible on those ones you've already marked. Some generic window cleaners work, but not some others... Windex works. I'm thinking it might be the ammonia in it, but haven't tried straight ammonia to check the theory.
Edit: I've tried straight ammonia, and it works too.
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