Anyone Tried Mr Clean erasers for alage

[DEAD_BY_DAWN]

So ive tried everything
Magnets
Razor Blades
Kent pro's
Etc
And to no avail i can't get this stain off my glass yes it's there not being paranoid i have a witness thanks Kevin .
So it seems there safe but i need to be 100% sure so any input would be appreciated.
To be more specific about the problem it looks like diatoms or a very light stain on the glass (the tank was used)
More easily noticeable when the Actinics are on .