A home occupation shall not be conducted or permitted in a manner which detracts from the residential character of the neighborhood or which tends to create a business atmosphere in the neighborhood. A home occupation shall not be conducted or permitted in a manner which causes the premises to differ substantially from nearby residential uses by the use of colors, materials, construction, lighting or signs; by the emission of sound, noise or vibration; or in any other way, which would be noticeable to a casual observer. A home occupation shall not be conducted or permitted unless it is clearly incidental and secondary to the principal use of the dwelling purposes. The exterior appearance of a residential structure shall not be altered to conduct a home occupation. A home occupation shall not generate traffic, parking, commercial traffic, parking of commercial vehicles, sound, noise, vibration, glare, fumes, odors, electrical interference or nuisances beyond what is customarily and ordinarily found in a residential area or which detracts from the residential character of the neighborhood. An accessory building may be used for a home occupation, but no area outside a building shall be used for storage or other purpose in the conduct of a home occupation.