It means neither. No one does the cleaning nor did anyone do the cleaning because to "get" the car washed means it still hasn't been washed. To "get" infers a future event and therefore has no relevance to the present moment in time, simply because the so-called 'future' as well as the 'past' do not technically exist.
Only the 'present moment' exists in reality and there are no forward or backward extensions of the present moment. Everything and anything only exists right now, this instant, which is the definition of the "present moment".
When it is said that the road to hell is paved with good intentions, this also applies to one's intent to get the car washed by any means at their disposal. This means however, that 'good intentions' can never be stated with an absolute guarantee that the task will actually be completed. That is why good intentions are not worth the breath it takes to speak them out loud.
