I wouldn't seal the driveway. You've just turned a virtually maintenance-free driveway into one that now requires maintenance. If you were gonna seal your concrete, basement walls, then I'd have a different opinion.
Just use a relatively low-powered pressure washing. If the pressure is too high, you may damage the pavers. You only need enough pressure to loosen up dirt and grime. As for what to use for a cleaning solution, I suggest you ctc your installer and find out what the mfgr. recommends. I'd suspect if you have colored pavers or designer pavers, something other than standard concrete cleaner would be used. I'm not sure but that's what I'd do.
Others may want to suggest sealing but not me. I do seal my asphalt driveway but that's because it calls for it. I don't think your pavers do. Others??? My best to ya and hope this helps.