Washing instruction labels on textiles such as curtains and black out blinds

Hi all

I hope someone with experience in selling textiles such as a curtains and black out blinds can advise me. I can't find any instructions about whether I need to add a washing label (i.e. at 40 degrees celcius etc). my supplier forgot to add the labels I had requested and now I am not sure if Amazon will accept the product as it is.