White Stains On Fleece?

[Kirsty]

Hi there
Can anyone tell me what these marks are? I've only noticed it since I changed from wood chippings to fleece? looks like some sort of white discharge? is this normal? All my guineas are boys?

 

[Chief Guinea Pig]

Because the fleece is dark, is shows up the calcium in wee, so it looks like wee stains. Some white vinegar in the wash should clear it.

 

[Kirsty]

Oh I see! It comes off when I wash it anyway, I was just curious really to what it was thank you

 

[piggyfan]

Guinea pigs get rid of excess calcium through their urine. I must say, I rarely see white patches after switching to these pellets,
http://www.zooplus.co.uk/shop/small_pets/food/guinea_pig/vitakraft/262148