The sauna at The Backyard Fun Store LLC in the city of Newark, in the the state of Delaware Based on the reviews, the store is focused on hot tub sales and service, not a spa with sauna facilities. Therefore, cleanliness is not directly mentioned. The reviews focus exclusively on hot tubs; there's no mention of a cold plunge or pool. No membership is required; customers purchase hot tubs and related services. The reviews suggest walk-ins are welcome, as there is no mention of appointments being necessary.