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Wiping or rinsing with a suitable solvent is the recommended method for removing excess penetrant in Liquid Penetrant Testing because it effectively cleans the surface without damaging the material being tested. This method ensures that the penetrant remains in the flaws or defects, which is crucial for accurate detection during the inspection process.

The use of a suitable solvent helps dissolve or remove the excess penetrant while minimizing residue that could interfere with the subsequent development step. This is particularly important because any residual penetrant outside the flaw can cause false indications or affect the reliability of the testing results.

In contrast to this method, using ultrasonic cleaning methods may not be suitable as it could introduce excessive agitation that might dislodge penetrant from superficial defects, leading to missed indications. Applying heat to evaporate the penetrant is not advisable because it can alter the chemical properties of the penetrant and potentially damage the material. Scrubbing with abrasive materials poses a risk of scratching or otherwise altering the surface of the test object, which can lead to erroneous results or damage.

Therefore, the chosen method of wiping or rinsing with a solvent balances effective cleaning with the need to preserve the testing surface and the indications being sought.