Here are some easy ways of Vedic Astrology remedial measure. Some of the remedies I read in sites, classical texts etc. Some remedies I also got from my own experience. These measures are only my personal opinion - might strange pretty strange though. But I believe that people might be benefited from them, so I put them here. It is just a very humble attempt of me to help people.

        You will find that sometimes I have suggested to avoid using materials pertaining to the planet(s) related. Do not take them always literal, that is not needed. But, try to link your activities and what sort of materials and other goods you use, when you run a particular Dasha period. You will surprisingly note that most of the times these items relate to the planet this way or that way, either for their natural significations or for their lordships. So, if you have a very bad Sun period in the past, try to remember if you have used any Sun sort of goods in that period or did any Sun sort of negative activities, such as being too authoritative on people. And then, avoiding such stuff again will be a powerful remedial measure for you! 

About donations and charitable works - Donation and charity are sacrifices and that is why great positive karmas. This is believed that it also pacifies a harmful planet when that planet type of things are donated. Some also say that you might donate money to a poor for buying foods and medicine, but if he uses the money for bad purposes such as buying addictive drugs, then it is rather put upon your shoulder. Helping the old, poor, needy, distressed is a very good way - there can be no doubt that it leads to freedom from bad karma much or less. Donate foods, medicines, money and other materials to the poor. If you do not have money or any material to donate, then at least, say good and nice things, make the person feel better at least! It will