There is a strong musty odour emanating from the crawl space of our house, especially on humid days. The crawl space is about 3 feet high with a concrete floor. Ventilation is probably insufficient because the house is surrounded on two sides with a concrete verandah which makes cross ventillation impossible.

The area is relatively clean. I did notice black sooty spots on the white electrical wires... (Is there a way to include photos on this forum?)

A heating contractor suggested spraying with a weak solution of bleach with a garden sprayer. Are there better short and long term solutions ?