Oil slick on tank glass surface

[Aw3s0m3]

So this tanks been sitting empty for about 6 months and most likely some type of chemical got on the surface and I've been trying to get it out but it doesn't seem to be wiping off. Any ideas on how to get it off?


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[Aw3s0m3]

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[spiff44]

dish detergent and a thorough rinsing

 

[xraycer]

Try acetone