Best cleaner product for velvet sofa

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I have just acquired two gorgeous royal blue velvet sofas - I think they have fabric protector applied when they were new (double checking tomorrow). They look brand new and I’ve been vacuuming them each evening.

I wondered if anyone had any recommendations for a product to clean them with occasionally.

thank you

Not a very exciting solution but I just use washing up liquid and water on mine. It brings it up nicely.