Chenille is most commonly cotton, polyester or viscose on the "hairy bit". If viscose, all the usual problems of this as a cut pile still exists. If you think of viscose as being similar to paper, you wont go far wrong. It can wear very rapidly in contact areas so look for areas that appear to be a different colour and texture to elsewhere.. Don't be aggressive with agitation. Probably wise to be pH neutral pre-spray and rinse. Test ALL colours and test for pile burst. Polyester is probably the most popular hairy bit of the fabric, but be prepared for anything.
Safe and happy cleaning
Ken