I usually try and find out at the beginning who is our regular maid, then nearly half way through tip her in person and again on departure. It usually produces good results in that when I tip her half way through, the maid usually asks if I am leaving tomorrow and I reply no I have another 8 days here. The next 8 days the service is fantastic, extra towels and extra chocolates automatically appear, at the Radisson in Malta (where we have a suite) the kitchen is spotless with extra coffee and dishwasher tablets, as well as anything left in the sink is washed up and put away rather than put in the dishwasher and switched on.
I did this at Animal Kingdom Lodge in Disneyworld on each of our three visits, suddenly signed photos of Disney characters were left on my daughter’s bed, the maid on one trip even made things out of face cloths and towels and left them on her bed.
Macl1uk