If you have marker stains on your upholstery try using hairspray to remove it. If you use hairspray, spray it onto a cloth and wipe the marker stain.

Do not spray the hairspray directly onto the upholstery. Too much of it will soak the upholstery and it could leave another stain.
Source: http://www.cleaningtips.com/tips/house/upholstery-cleaning/marker-stained-upholstery.html