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Circuit laundry costs?

Hi all,
My building uses circuit laundry and I only have £4 left on the app right now does anyone know if that's definitely enough to do a wash?
I'm pretty sure it's usually like three quid something but I've never really paid that much attention and I don't wanna go put all my laundry in the machine then have to take it out again if it's not enough.
Drying isn't really an issue because I can just hang stuff up.
I'll top it up if I have to but it's so annoying that if you're like a quid short it makes you give it a whole fiver.
Cheers all