The secret to removing wood chip is to use the scraper to remove the chips - then roller on loads and loads of hot soapy water until it almost falls off.
If you read the reviews on this one (very similar to the other one I posted) you will find someone used it dry for woodchip after trying a steamer in the past
I've spent the last few months removing woodchip from every ceiling in the house we just bought. I tried the steamer on the ceiling, I wouldn't recommend it unless you like really hot water rolling down your arm and dripping onto you. Oh yes and of course the ceilings are in terrible shape underneath. Currently getting them all replastered.
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