Model Sailing Ship Kits I Am Buliding A Model Ship, 1/350 Scale Cutty Sark.it Has White Plastic Sails, I Want To "antique" How?

I am buliding a model ship, 1/350 scale cutty sark.it has white plastic sails, i want to "antique" how? - model sailing ship kits

My idea was to paint and Burnt Sienna, you wipe diluted afterwards.
reletivly but the plastic is soft. This is a set of "Academy" hobby models.