I have a hotel with the same thing.
The biggest problem in the hotel is the fire retardant. If it isnt dried evenly it creates water marks due to fact the retardant is salt based.
You need to use ultra LM for it as it can shrink easily.
How badly soiled is it? A detergent/solvent based spray, brush, vac only with handtool and towel with an air mover on it straight away may be the safest option. Do you have any steam cleaning kit?
If you really want the job (other work) heavily qualify, get paid to do a test area somewhere inconspicuous (if possible)
If you arent to confident with fabric cleaning then not the best installation to learn on.
Any pics of it?