osculating
If you're looking to buy one, it may be useful to know the word is "oscillating".
The osculum (plural "oscula") is an excretory structure in the living sponge
Sponges are totally a DIY thing, I think you'll find. He is obviously referring to sponging down the new grout.
@NotThamesWater started
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If you're looking to buy one, it may be useful to know the word is "oscillating".