I know that the clay bar should only be used every few months, but after every wash I will run my hand up and down the hood and I can feel all of the grime and grit that washing missed. Do I need to do a better job washing? I use the two-bucket method and use a microfiber sponge. Anyone else feel this way? It rains a LOT here (sometimes multiples days per week, its rained 4 times the last 4 days) and there is always a ton of pollen/dust in the air. It can rain an inch in the morning and then 10 minutes later it will be very sunny out and will hit 95 degrees and all of the water marks will be baked on. The weather here is really hard on my car. How often is the clay bar needed?