Selected spacecraft magnetic cleanliness problems and their solutions

Four specific magnetic cleanliness problems from the last 30 years are discussed and their solutions are shown. These are the ESA GIOTTO Comet Halley despin motor compensation with its 1200 pole motors, the four CNES Mars Netlander solar petals optimization, 3-D field calculation and visualization using Visual Basic, the ESA ROSETTA huge solar petal 3-D field calculation, visualization and compensation and finally the NASA/ESA CASSINI-HUYGENS separation and its visualization with the help of Huygens magnetic cleanliness results.