Thank you for your question on cleaning a King size bedspread in the washer or dryer, that is dry-clean only.
I would not recommend doing this for fear it would stain the garments or the bed spread.
These machines were not designed for dry clean only items, even using the Steam Refresh cycles.
It may work for refreshing garments but not cleaning.
There is a product on the market by the name of Dryel to be used in the dyer for dry clean only items.
If you had a large enough Dryel bag you could do it in the dyer on regular dry cycle but I would not recommend something that big in either the washer or the dryer.
Some of the smaller articles of clothing that are dry clean only, like designer blouses and sweaters and jeans could be done with the Dryel process.
I have had good success with the Dryel product in the dryer but I do not have a lot of clothes that are dry clean only.
Hear is just on site for the Dryel product if you want to look at it.
Thank you for your question.