Which method is considered best for removing excess water washable penetrant?

The best method for removing excess water washable penetrant is using a hose and nozzle with a coarse spray. This technique effectively washes away the penetrant from the surface without damaging the material being tested. The coarse spray ensures that enough force is applied to remove the penetrant without leaving residues that might interfere with the inspection results.

Using a hose and nozzle provides control over the pressure and allows for a thorough rinse, which is crucial for ensuring that any potential defects are not masked by leftover penetrant. It also aids in preventing any excess penetrant from reentering the cracks or discontinuities that need to be inspected.

Other methods, such as using a soft cloth or a sponge, might leave traces of the penetrant on the surface, which can compromise the effectiveness of the testing. Using a high-pressure washer, while it does remove penetrants efficiently, can risk damaging more delicate materials or surfaces, thus making it less suitable compared to the controlled application of a coarse spray with a hose and nozzle.