[Avo]

seriously mate why are you that bothered??

if the customers hasnt said anything then leave it.its due to the frames being old mainly and lack of cleaning previously.

if your really that bothered mention it to the customer and ask him/her whether you can go inside and clean them that way from the inside.

DOKTOR POWER is what you need and a non scratch scourer.

I agree!!!
When windows having been left for years without a clean the frames can take more than 1st cleans they can't expect a miracle clean first time!!  Well unless your charging for a full intense clean!!
Doktor power by hand only thou  don't try putting into your brush head as I won't lift out the marks.

[Tadgh O Shea]

So what do you use then

I would recommend a micelles based heavy duty degreaser (non caustic & non corrrosive) coupled with a microcleaning handpad (magic sponge)

The handpads are lightly abrasive but are extremely effective when it comes to a task of this nature, when using them on a pvc frame its important to scrub the surface gently

[John pearce]

seriously mate why are you that bothered??

if the customers hasnt said anything then leave it.its due to the frames being old mainly and lack of cleaning previously.

if your really that bothered mention it to the customer and ask him/her whether you can go inside and clean them that way from the inside.

DOKTOR POWER is what you need and a non scratch scourer.

BECAUSE  when i  traded these windows, that little scrub with the rag kept these rubber tear marks at bay, since using pole im getting them on quite alot of windows, and its pi..sing me off, all the tops and sides are nice, but bottoms are dulling up, and i know its because of the rain and sun shine damaging it too, just wondered if these liquids shifted it,  i got my 5 lt pump and brush ready, but dont think i will bother now after what tadgh o shea said,  i try some doktor powder on my doodlebug pad.  cheers john

[Dave Willis]

I wonder if anyone has told Autosmart that their product wrecks paintwork? I have a feeling they may have checked this before unleashing it on Garages etc.  

Nasty stuff possibly    http://www.polishedbliss.co.uk/acatalog/autosmart-g101-cat19.html