To have one shirt, pair of pants and a pair of sox laundered (ie normally daily wear I suggest) costs $16 ie GBP10. So at the end of this three week trip (yes, I know, sheer hell) I am down by about GBP100 just in laundry charge. If I include the drycleaning of one suite and a pair of uniform trousers, that jumps to GBP150.
Or you could dhoby it yourself..? Just a viewpoint but most people would do their own washing and not expect the taxpayer to fork out.
Why don't you nip down to the local corner shop...spend £1 on a bottle of travel wash and then save the tax payer £499 per year..... Are you looking to become a Member of Parliament ????