Hello

I know this topic isn't related to arms and armour but I really need your help guys.We have a linen tent.Last event was wery wet.There were lots of mud.And tent is now quite dirty.It is a heavy linen with some kind of impregnation.We tried many chemical substances but it didn't help much.
Any ideas how to clen it?It is too large for a laundy.

My tent is cotton, but I have always had success by laying it out on my driveway and scrubbing it with a floor brush using water and dish soap to clean. Of course, it's navy blue...