Grey Horses Stable stains

[Horselover2345]

Hi,
I have a grey who's stable stains have never been that awful and I've managed quite well with them. However, recently they have been a lot worse! I( do not think of the possibility of a disrupted night or him being distressed at all as the bed has not changed much at all. Even wearing a fly sheet at night they still manage to magically appear!? Any answers as I an just too confused? Any advice in removing them would be appreciated too!
Thanks

 

[oldie48]

I find stain master works quite well, I spray it on, scrub lightly with a soft nail brush and let it work in, then wash off.

 

[Hairy Horror]

I have found gold label stain remover spray to work really well, it's in a little spray bottle. Turn out rugs for the stable also help.