We have just brought a new sofa about 6mos ago. It’s a very light

https://www.hunker.com/13422973/how-to-remove-blue-jean-dye-from-upholstery

You could try rit dye remover

I just read about cleaning microfiber furniture. You spray it with rubbing alcohol and rub with a white sponge.

This is a great question, I had this dye transfer problem with my cars light beige leatherette seats. I ended up buying seat covers.

Get a sofa cover until your kids are gown. Outlaw shoes and blue jeans from the living room, as jeans and shoes have parts of them that can rip, scratch or stain your good furniture. We have all children place their shoes in a wooden box next to the front door when then come into the house. No more lost shoes when it’s time to go home, no more boot marks and “tap” shoes scratching the shiny floors, and no more resting shoes on the coffee table. And fancy dresses are changed to play clothes, which are always soft, so the sparkly stuff doesn’t tear something, and the over-dyed decorations don’t streak. Happy grandparents, parents, and children. ☺️

I used Bissell furniture fabric cleaner and it worked great for me. Had the same problem after someone with new jeans sat on the good chair.

Mix one tablespoon of liquid dish washing detergent and one tablespoon of white vinegar with two cups of warm water. Using a clean white cloth, sponge the stain with the detergent/vinegar solution, blotting frequently with a dry cloth until the stain disappears.