Following is the best advice for getting the job done right:
1. Use a professional pressure cleaner whom has had years of experience.
2. Use premium cleaning products for the purpose of use
3. Look for hazards, example, electrical sockets, cracks, plants, clothing on the line next door, vehicles and human safety
4. Have appropriate high pressure water cleaning jets
5. Understand the surface to be cleaned (how much high pressure water can it take before surface damage occurs
6. Insurances a must