Don Aslett Museum of Clean is at 711 S. 2nd Ave. This five-story green building, a renovated 20th-century brick warehouse, is filled with captivating themed displays that relate the history of cleaning. More than 5,000 items are exhibited, including art, appliances, tools and live cleaning plants. How-to videos, such as “How to Clean Your Bathroom in 3.5 Minutes,” offer quick and easy cleaning tips to visitors. The three-story Kids' Cleaning World teaches children about cleanliness and responsibility and features mops, buckets and other supplies for wee ones to try out.