Old coffee cup

[worriedatthemoment]

Just found in the door of my car half a cup of coffee that think ds had about 3-4 weeks ago
Some of it splashed on the seat when i took it out , how will i get this out of the seat now shall i let it dry then clean or clean now
As for the cup i guess its ruined hod knows whats growing in that coffee cup , white coffee so had milk , no sugar

Can anything nasty dangerous bugs grow in old coffee ?

Just wash the cup!

Just wash it! If you’re really worried soak it overnight with a drop of bleach or Milton.

Why would the cup be ruined

I can't work out the issue here spray the seat and wipe coffee off.

As for the cup is it a household mug? If yes and you want to keep it as its part of a set then wash it in the sink, better still get your son to wash it.
If you aren't fussed about the mug then just bin it, you haven't noticed for 4 weeks that it was missing anyway so can't be that important.
Buy your son a reusable takeaway mug for Christmas and remind him not to leave it anywhere long enough for it to go rank.

Wipe the seat and leave to dry.
Stick the cup in the dishwasher.