Certainty SmartBoost is awesome! I got this for my husband's workout clothes but now I use it for everything - including towels and sheets, And, it is really great for all of my family's cloth masks! It really helps to keep smells away. I know that I wash my husband's workout clothes - but the minute he starts working out - they start to smell. Once I started using Certainty SmartBoost that changed! Sometimes I can't even tell that he wore a shirt in his work out. One small bottle lasts so long (just make sure you read the directions about how much to use - much, much smaller amount than what I use for detergent.) And it is so simple - my detergent goes on my clothes and this goes where I would normally put laundry softener and I am done - no need to watch the machine like with other products - my machine applies it at the right time.