Over a year ago we put a good sized set of IKEA Platta deck tiles on our patio. After exposure to the elements, they are now dis-coloring and becoming a bit 'rough'.
What exactly do I need to do to get them back into shape?
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These tiles are made of Acacia wood, which is OK for outdoor use, but must be re-oiled every year.
Here is my suggestion for yearly maintenance:
All wood will discolor in time with exposure to the sun's UV rays.
Any reason you're not just following the instructions on the product page you linked to?
Treat the floor decking with oil at regular intervals in order to protect and retain the wood. Note! Make sure that it is clean and dry before being re-oiled. Location: Outdoors. Can be left outdoors all summer.
[Not tyring to be difficult, but since you didn't mention the instructions there, I figured you may have missed them.]