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I bought my mother a plastic "bonnet" to help keep the water out of her eyes when we wash her hair.
The plastic comes around the head and attaches with velcro strips in the front. This will keep the dye out of eyes. It also has a tube that goes down the back that directs the water away. When you rinse, you could have this empty into a bucket.
If the person cannot sit up, I have seen shampoo devices on medical websites.
I would start with Amazon and Ebay...try "shampoo trays."