[Ian Lancaster]

Anyone come across it?  I had a job a few years ago where there were weird 'cloudy' marks on the glass.  Washing didn't get it off so I tried damp and dry scrim - still no joy.  I concluded that it must have been on the inside surface (single glazing).  The customer complained so I went back to check again - he insisted it wasn't on the inside and when I had a look he was right.  I had another try on the outside but still couldn't get it off and it was only then he told me what it was   He'd had a break-in a few days previously.

Did a quote today and after I'd booked the job I noticed marks on the double glazing.  Wet finger and hard rub had no effect so (having forgotten previous experience) I rang the bell and asked the householder to come and look.  She watched me try to make some impression on it and when I couldn't she said it must be on the inside.

Left it at that but thinking later I remembered what had happened all those years ago.  Coupled with the fact that she asked what the arrangement would be if she wanted to cancel (always gets alarm bells ringing!!) I phoned and told her that I thought the marks were finger print powder and that as we guarantee perfect results but in this case wouldn't be able to achieve them I withdrew my offer of service.

No argument, didn't sound surprised, just said "Oh, alright then".

I reckon she was just after a 'one-off' even though I told her we don't do them, and then she would have used the marks as an excuse not to pay and to cancel after the first time.

Lucky escape

[Susan Dean (1stclean)]

we had one last week , hit it with neat viasol on a micro fiber gave off after a while

[Elfyn]

Ultrapack Renovate from prochem might do the trick

[brianbarber]

Had this last year, fairy liquid on brush and came off.
I suspect this stuff is hard after a time to remove, this custy was only robbed a day or two before I arrived.

Recognised the powder as I had a detective kit as a kid and remember using the powder to dust your own dabs!


Mr B

[Susan Dean (1stclean)]

Ultrapack Renovate from prochem might do the trick

pog is better

[Smurf]

Had a car once dusted on the outside and it washed off the glass etc the day after in the rain no probs.

I can't say I've ever come accross it on house windows frames & glass though but like you say any brand of paint, oil and grease remover (P.O.G.) would do I suppose.