You have a solid stain. -Let the new wood weather for 3 months. -strip off what you can. Brighten to neutralize. You do not need a cleaner. -Sand a...
Penetrating stains will not peel:
You have to strip and brighten the wood to fix this. Use Restore A Deck Stain or Defy Extreme.
It will not warp or cup if you stain just one side. Try the Restore A Deck Stain or Armstrong Clark.
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Yes, you should be able to.
You should be okay with doing this.