Here are some photos of a cleaning process that is very easy to do and doesn't require hard scrubing or chemicals
Due to the nature of outdoor condtions however a chemical process may be required depending on the desired finish.
Using a sealer helps with the cleaning process however the sealer must be reapplied at least every one to two years on average sealers.
After two years of being on the ground as you can see a build up of fine dirt and and stains doesn't take long to dull the effect the pavers once had. This cleaning process shown isn't chemically aided. A high pressure washer and blower vac is all that was used in this cleaning process.