If you have a bottle of anti bac handwash by your kitchen sink (as I imagine most of us do atm).
If you have a t shirt or top wirh slightly sweaty smelling armpits - turn it inside out, wet the offending area with cold water, pump on a bit of the soap, squeeze through the fabric, give it a bit of a rub, stick in the wash. Your tops armpits will come out smelling sweet and fragrant. Especially relevant if you have dc who do sports in nylon tops!