if possible i pressure wash to steer with to get the worst off, it also gets the whites looking great..
of course don't pressure wash if they get leaks, or it's an old conservatory, i just discuss options with the customer first..
[attach=full]6866[/attach] just literally got home from doing one, i pressure them now, and then brush them with pure and rinse after... never bother with chemicals, i like to keep things simple and scrub and rinse, but if possible i pressure wash to steer with to get the worst off, it also gets the whites looking great..
thats does look good jake. i just use an old brush, the tried and tested 