Be prepared for a bit of gardening. Find some purifying earth [turab tahir] as you would for the earth used for Tayammum. This is basically earth that is not contaminated or mixed with any impurity [turab mutanajjis]; nor earth that has already been used to purify something in an earlier washing [turab musta'mal]; nor earth that can no longer be called earth if, for example, mixed with cement. Wahl or mud that is deposited after a rain for example is also acceptable, as it is with clay (even potter's clay) and fine sand (as long as it makes the water cloudy). The purifying earth is usually something that one can easily acquire from one's back garden. You don't need much earth, less than 1/2 a cup-full will do (depending of course on the amount of the thing that needs purifying.
Once you have accumulated some purifying earth, prepare a container of pure water.
It is preferable [awla] to mix the purifying earth with water in the first washing and it is not preferable [khilaf awla] to mix it in the last washing. The solution should appear kadar [muddy or cloudy] depending on the kind of soil you use. If it is sand for example, it would not be as cloudy as when a darker soil is used.
Once the water-earth solution is ready, use it to clean (or rather treat) the contaminated area or the area affected by the impurity [mahall mutanajjis]. The method of washing can vary (the one I am giving you is 1 out of 3 possible kayfiyyat). Since we have already mixed the water with earth, you will be pouring the solution to all of the affected area (the water here acts as the wasita [means or medium] for bringing the earth to the impure area). You can of course skip #3 above and mix the two later such as water is poured first on the affected area and the earth is added later on. However, for practical reasons it might be easier to mix the water with the purifying earth first.
