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UPVC window "leaking" yellow substance from a join when raining?

My window seems to leak a yellow substance on the inside of the frame when it is raining, it then remains sticky where the join is
Ann Hodgkiss, October 2006
Anne
It may be a screw inside the extrusion rusting or metal swaf
rusting. The acid in the silcone attacks screw head causing yellow stains (some times ) not much you can do, clean with cif.

david 30yrs a d/glazer, October 2006
Ann. There is no yellow substance added to window extrusion during the manufacturing process. An outside possibility is that some joker stuffed a sweet into it before it was 'V' cut, bent and welded.. More worryingly though is how it is getting out.
Kev@K.L.Plastics

Kev, October 2006