Every 3–6 months
How often pillows should be washed to prevent stain buildup and allergen accumulation, according to the source.
For those who follow through with one of these three methods, the next step is building a consistent maintenance routine: washing pillows every three to six months, using pillow protectors to slow future buildup, and sun-drying bedding periodically. The open question for many households is whether memory foam pillows — which cannot be fully submerged — can be adequately refreshed through spot-cleaning alone, or whether more targeted products are needed for that material.
