I am from the same country as him too but I have no idea wtf he is talking about. Usually we replace the word powdering with pissing, but it still doesn't make sense.
In fact, I notice in the last post I am still being insufficiently clear.
I'm don't know about Calcium, but I am pretty sure that Phosphorus is found in urine.
The article has got to be a "tongue in cheek" (or "Nigey under the fuel flap") contribution to the "Stepneygate" discussion. Fancy impounding his trousers!
Phosphorus and calcium? ...sounds like Landry soap or an analysis of detergent;... give the guy a break, he is middle age and almost everyone drips a drop now and then.... trousers next you'll be talking about Miss Zwinky's briefs
Next I'll have to watch nobody steals the personals off the washing hanging outdoors, where's the Moderator