[Mike 108]

I'm doing some problem windows tomorrow (WFP).

My plan was to spray/brush the glass with a dilution of TFR and leave it for 20 minutes before going back to clean using WFP.

A colleague has told me that he has seen advice given on the forum NOT to let TFR dry on the glass - as it is very hard to get off, once dry.

Anybody else heard this or have any experience of such?

Will read later.

Thanks

Mike

[Jeff Brimble]

Depends on the dilution rate, but yes you can get white stains if left too long. 5 min max.
Try a pre scrub with gg3 or 4 first.

[Mike 108]

Thanks for that info, Jeff.

Mike