[barrylanc]

Hi all,

has anyone had customers who have said that the brush head has made scraches on their glass. I have used the wfp for years and in the past 4 months two customers have said this.

[newclean]

yes i did, the customer said i scrached her glass, i checked the glass and yes i did, i put my pole down, somehow
the brush head got some sand in it, i remember trying to get some bird mess off, that when i scrached the glass
it cost me £120- not a good day for me

[Ian_Giles]

The bristles of the brush will not scratch glass, regardless of whether or not you have picked up any sand or grit in the bristles, the pressure exerted is simply not great enough, plus the constant flow of water through the bristles makes scratches harder still to occur.
You are way more likely to scratch glass with an applicator when working trad, grit can become embedded in the applicator sleeve and can remain in constant contact with the glass under greater pressure...and I have yet to see scratches occur in that way either (potentially possible yes, but very unlikely).

The stock of the brush is a different matter, the plastic can get roughed up and grit can easily get embedded in those roughed up area's, use the stock of the brush to rub off some bird poo and you can easily scratch the glass.

If the customer claims it is the bristles of the brush doing the damage, give them the gear and ask them to deliberately scratch the glass with it, and they will not be able to do so.

Actually, I'm thinking of experimenting with rubbing my brush into the garden, getting it covered in dirt and then scrubbing it onto one of my own windows just to see what effect it has (or doesn't have) ditto with some sand and the like 

Ian

[stephen s]

some brushes will scratch glass just like some will scratch car paintwork,  I know some double trim brushes are not advisable to use for cleaning cars with,  however Vikan brushes have no such problems

[Londoner]

The original purpose of Vikan brushes was vehicle cleaning.

[Sapphire Window Cleaning]

You can't compare scratching paint work on a car and scratching glass, paint on a vehicle is very soft you can actually scratch the paint with your own finger nails, glass on the other hand is very hard, try scratching glass with your finger nails and see how well you can scratch it.
Plastic cannot scratch glass, stones and the like can though. I never use my stock to rub off bird muck, I give it a very good soak to rehydrate the poo then clean the other windows making sure the one with the bird poo is the last window to clean.

[mistersqueegee]

Only an item that is as hard as or harder than glass is capable of scratching glass. Even a metal razor isn't as hard as glass and when properly used can't scratch it. Rust on the other hand is harder than glass and can scratch it. Sand is also capable of scratching glass since it's as hard as glass.
The biggest culprit in scratched glass on this side of the pond is fabricating debris on tempered or heat strengthened glass.

[mistersqueegee]

Only an item that is as hard as or harder than glass is capable of scratching glass. Even a metal razor isn't as hard as glass and when properly used can't scratch it. Rust on the other hand is harder than glass and can scratch it. Sand is also capable of scratching glass since it's as hard as glass.
The biggest culprit in scratched glass on this side of the pond is fabricating debris on tempered or heat strengthened glass.