Amen to that, Spanners. At one company I worked for, the guys washing the a/c were the same guys cleaning the lunchroom. Knew about cleaning...knew $hit about aircraft!!
They washed one, one night, and decided to cover the static ports with masking tape, which when soaked becomes nearly invisible when on a titanium surface. They forgot to remove it, and it was missed on subsequent walk-arounds. At the time, there was no work card in force for washing the a/c. The a/c went flying with a full load of pax.
F/O noticed no increase in indicated altitude, but noticed the trees were getting smaller!! Capt declared an emergency, a/c landed safely. Luckily, wx was cavok.
Just proves a point... NO-ONE should be allowed to do ANYTHING to an aircraft without the proper training. By the way, the company , at the stern insistance of Transport Canada, had a work card done up the next day!!
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"You want it on the gate for WHEN??"