Removing stubborn watermarks

[Danny]

I've tried scrubbing with a sponge and RO, scraping with a razor blade while wet, limescale remover and a toothbrush to scrub and nothing works.....

Any ideas chaps?

 

[Ispookie666]

Use vinegar or citric acid

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[Danny]

Use vinegar or citric acid

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Does it matter if it's white or brown vinegar?

 

[Gill]

White works better in experience.

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[Ispookie666]

White

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[MirandaB]

My go to for this is Kilrock Gel....brush it on and leave for 5-10 mins then rinse off
Do bear in mind though if the limescale has been on there a long time it can end up etching the glass permanently.

 

[roadmaster]

If other side of tank looks better,then turn tank around? stains will be much less noticeable on back glass..
6% cleaning grade vinegar and warm water has worked for me in the past.