Classic cars forum & vehicle restoration.

[PACresta]

I have been given 4 front and 2 rear screens for my Cresta. The screens have been stood outside for a long period of time so consequently have a patchy film of what looks like limescale. A stanly knife blade cuts into it and it comes off in a powder form. I have tried Meths, vinigar, bleach, thinners all to no avail

Has anyone come across this problem before? Any tips?

Thanks

[Brian M]

Pete

Sorry to state the obvious but have you tried a limescale remover usually used for toliets and baths etc.

I have found it dissolves all sorts of crusty type deposits.

[PACresta]

Have tried Jiff, have been recommended to try Calgon so will give that a go.

[Scotty]

Jewellers rouge is a fine grinding compound suitable for glass, or at a push even Brasso if the rouge is difficult to find (which it probably will be).

[john-saab]

I used paint renovator (T-cut) to remove scatches from my cars windscreen...it worked a treat so i can't see why it wouldnt work here.

[Uncle Joe]

You can try pumice stone as well. If you dont know where to get hold of it, I can give you the name of a supplier in the UK.

UJ

[UKdave2002]

I’d avoid using abrasive methods if at all possible as there is always a risk of scratching the screen, which will then require more polishing.
If it is lime scale, hydrochloric acid will shift it very easily, you can buy it in diluted form builder’s merchants, it’s sold as brick cleaner.
Dave

[Uncle Joe]

UK, although Jewellers Rouge and Pumice Stone are abrasives, there should be no problem whatsoever using them. JR is so fine it is used for polishing gold, and PS for antique furniture restorations.

UJ

[UKdave2002]

UJ If its like JR presume the pumice stone is in some form of powder or paste then? I thought you were advocating using an actual pumice stone! hence the caution!!

Dave

[Uncle Joe]

UK, sorry, its my fault! What I should have called it is Pumice Powder. Its usually bought in what is known as 6/0 grade.

There is a finer one as well, Rotten Stone. Another powder, but correct terminology this time!

Expect to pay around £4.50 - £5.00 for 250 grammes of each.

UJ

[PACresta]

Thanks for that Dave, i tried a small area with brasso this morning (didn't have any t-cut) and it works. Take your point with the scratching though Dave and i will try your suggestion, sounds good to me At least i have established it can be removed, i thought it had permanently stained the glass. Thank you all for your suggestions, great help.