Stain on Polyester!

Stain on Polyester!

I just noticed that the nightgown I was wearing has a stain on it (recent, probably the last few hours)! The stain is probably some sort of juice and the nightgown is polyester material. It cost me quite a bit, so I'd really like to try to save it! I really don't have many cleaning products on me or any club soda...would it be wrong to wait a day before I try to remove it correctly? I have to go to work now and won't be home until very late tonight...or is there something I can do now so that it doesn't set? I am so not a laundry/stain remover whiz, so any help is appreciated!! Thank you!
Because you all do it so well!

Because you all do it so well!

Caterpillar and plant IDs

Caterpillar and plant IDs

A bit of picspam

A bit of picspam

Orchids

Orchids

Please help me stop murdering plants!!!

Please help me stop murdering plants!!!

Sunflowers and Stuff

Sunflowers and Stuff