Eureka!
Found Seventh Generation non-scented products in town.
Just posted this in a Chiang Mai/Health Food Store thread:
I found one listed in Happy Cow and visited it a few days ago:
J. Imboon
Chang Phueak, Super Highway Rd 11 (at Photharam Rd), Chiang Mai, Thailand
0930 - 1830 Wed - Mon
053 216 595
Huge Store, loaded with Vegetarian and Vegan food, Soaps, Detergents, Cleaning and Body products, as well as Buddhist and decorative items.
No fresh produce, no non-frozen refrigerated foods.
Extensive stock.
Veg. heaven for those into mock meats (not me).
I did find Seventh Generation scent free liquid laundry detergent (also have a natural scented version) as well as other washing/cleaning products from this company, scented and not.