This is something we learnt over the years.
It’s very difficult keeping marquee linings clean, especially when you’re flat out and they’re going up and down every weekend. To start with we used a commercial cleaning company who turned round the linings within 2 days, the only problem with that is the linings came back crinkled, we’d often get comments from customers that they needed an iron -we even hired a steamer for one particular wedding as the wrinkled linings were so bad.
Most linings fit into a domestic washing machine -all of our DIY Marquees are designed that way intentionally. Pleated linings up to 9mx3m can fit but you need a commercial washing machine for 12m and 15m.
So here’s my recommendation -wash the marquee linings at home in your domestic washing machine but only do it just before putting your marquee up the next time it’s out. Don’t put the linings in a dryer, put them up damp:
If your linings are really bad (if they’ve been stored damp for a long time for example) and have mould on then simple washing won’t get it out, it needs something more drastic. Spraying a small amount of bleach will usually get rid of patches, if the area affected is large you actually have to soak the linings in bleach, just make sure you wash them thoroughly afterwards and don’t leave them soaking for too long as it damages the velcro etc.
I hope that’s helped some people out there, thanks for reading.