Kerosene
Yes, dish washing liquid is soluble in water. The whole purpose of dish washing liquid is to make oily substances dissolve more easily in water, so it would have to be water soluble to perform its function.
So that all the liquid isn't immediately pulled through the filter. To wash the solid, you want the solid to interact with the liquid, to stir it, to make sure that any soluble impurities have a chance to be dissolved and removed. If you leave the aspirator on while washing, the interaction time of the solid and the washing solvent will be reduced. Add liquid, stir, and then turn the aspirator back on to remove the impurity-containing solvent.
How much laundry detergent you need in order for it to be effective depends on how many clothes you are washing. It also depends on how concentrated the detergent is.
due to the readiness with which it mixes with water, and its volatility
Depending on where you live, there may be an oil recycler who will take it. Check with you local sanitation or garbage pick up companies. Often, auto supply stores will dispose of old petroleum products for you as well. If you only have a small amount of kerosene you may let it evaporate or burn it safely.
Washing using water as a solvent for the dirt.
Raising the temperature of a solvent, like water, increases the solvent's capacity to dissolve a solute, like washing powder.
Bitumen or tar is an organic substance that repels water. The stain should therefore first be softened in an organic solvent (petrol or gasoline will do this but this should be done out of doors and away from any flame source) and as much of the bitumen as possible removed. Once this is done a hand cleaning substance (such as 'swarfiga') can be applied and worked in to the stain then the area rinsed in warm water. After this a good wash in a washing machine with normal household detergent should bring the stain out. Alternatively you could take the shirt to a reputable dry cleaners and ask them to remove the stain.
It isn't really. Water is the solvent when you are washing clothes. The ingredients in the detergent help the dirt into solution or suspension in various different ways.
Washing your hands.
White vinager and baking soda mixture. Let set for ten min then wash as normal
Washing your hands with soap and water is the most effective means.
Handwashing
The kits in the store don't really clean things. The dirt has nowhere to go in a bag in your dryer. In real drycleaning, a liquid solvent is used, and the dirt is rinsed out into the solvent, and away from the fabric (as it is in washing).
That is not a safe or effective method of preventing pregnancy.
Yes, dish washing liquid is soluble in water. The whole purpose of dish washing liquid is to make oily substances dissolve more easily in water, so it would have to be water soluble to perform its function.
So that all the liquid isn't immediately pulled through the filter. To wash the solid, you want the solid to interact with the liquid, to stir it, to make sure that any soluble impurities have a chance to be dissolved and removed. If you leave the aspirator on while washing, the interaction time of the solid and the washing solvent will be reduced. Add liquid, stir, and then turn the aspirator back on to remove the impurity-containing solvent.