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?
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?
[Not tyring to be difficult, but since you didn't mention the instructions there, I figured you may have missed them.]