Whatever method you use is going to need to be pretty abrasive anyway in order to remove that paint/ "preserver" from your deck so I wouldn't worry about it. You situation is a one off; I'm just saying that I wouldn't think it's a great idea to be using one regularly to clean a deck or any other timber construction. In short, yes I would use a power washer for your application.
Could anyone recommed a spec (power I guess) that would suit
- car
- decking
- driveway (brickwork)
Is it possible to vary the power?
Ballyman-the one you have sounds like it would suit?
Thanks suellen. Got a smaller Karcher in Argos for €89.99. Works good, except for the detergent......
And I have enough to occupy me here without doing favours I'm afraid .