Any short Cuts in ReApplying semi-transparent Acrylic stains?

Hello,

A few years ago I put a semi-transparent stain on my deck and fence. I want to reapply this year and wanted to know if I can gently power wash it, instead of using a cleaner and brightener?

After cleaning the fence and deck, can I just reapply over the old Acrylic semi-transparent stain? I used Olympic Maximum semi-transparent stain the 1st time around. Any thoughts?

Should I be using a different stain over the old stain? Ex. like switching to a solid stain instead of semi transparent. How about using a different brand?

Thank you for your time and I look forward to hearing your suggestions.