Is it standard for the bride to pay the boutique for the dry cleaning of a sample dress?

Hi all
I bought my dress from a boutique yesterday and it’s a sample that people try on in the shop. It was reduced because the boutique is getting rid of old stock not because it’s a sample. The boutique I bought it from want to charge me £120 for the dry cleaning. Is it standard that the bride has to cough up the money for the dry cleaning of a dress she’s only tried on once? Seems pretty steep given the boutique has used it for other women to try on up until that point and I’ve only tried it on once. So is this standard practice or am I being silly?