German cockroaches favor warm, humid spaces near food and water — kitchens, behind appliances, under sinks — and Valencia's a Mediterranean climate with mild, wet winters and warm, dry summers, with coastal areas moderated by ocean influence keeps them active most of the year. American cockroaches, larger and reddish-brown, prefer basements, drains, and utility rooms. A blend of established coastal and inland-valley neighborhoods, most built on slab foundations given the region's mild climate.
Treatment starts with locating the harborage points — the tight, warm, food-adjacent spaces roaches actually live in — and applying gel bait directly there rather than spraying open floor space. This targets the colony at its source and avoids the resistance issues that plague over-the-counter sprays. We follow up to verify the population has collapsed, not just scattered.