Soft Soap Liquid Antibacterial Soap (Aquarium Pump bottle) will work just fine and has a low fragrance level, available in almost any drug store or grocery store.
Many hydrangeas are sweetly fragrant and in full bloom the scent can be quite strong. A few variants are described as "fragrance free". While the scent is not as strong with the fragrance free...
no, it has to be a specific price in order to have free shipping on small orders, because if you only want one small item, then there might as well as be shipping also.