Get Rid of Musty Smell In Buggy?

We may need a translation here. Do you mean "baby buggy'? We call it baby carriage. Or some are "strollers". But unfortunately I don't know the solution to your question. I hope someone else will.

Sprinkle buggy with baking soda. You can a few drops of essential oil to the baking soda. Let sit for a while and then vacuum. The covers and coverings wash in hot water with your choice of detergent and instead of using fabric softener, use white vinegar. Tip: do not let these things sit in the washer or get wet and sit. this causes the musty smell to return. Let dry on a line outside in the sun.