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the heater core
Older heater with rust build up in the bottom of the tank.
A leaky freezer door gasket will cause ice to build up inside the freezer. This is because a continuous supply of air from the room, carrying water vapour, enters and the water vapour freezes.
you build up another object
If it is a "frost free" fridge-freezer, try DEFROSTING IT. Ice can build up out of site and stop cold air circulating in fridge. I had this problem and after defrosting it now works fine.
Salt in the water can build up and concentrate in the soil as it becomes trapped.
because the reason water evaporates is because it is heated up and is turned into a gas, the fridge is cold so it will go slower.
It causes tar to build up on the lungs and it can cause serious injuries and maybe even death.
Most water softeners remove calcium and limestone. These are not really harmful to humans, but cause a scaly build up in pipes and tanks.
water deposits
static electricity
poor nutrition is the major cause of high cholesterol and that is the cause of plaque build up