func _spawn_cleanser_particles(pos: Vector2i) -> void:
	"""Spawn bright cleansing particles when sticky is cleared."""
	if not main_scene or not gridmap:
		return
	
	var world_pos = Vector3(
		pos.x * gridmap.cell_size.x + gridmap.cell_size.x / 2.0,
		0.5,
		pos.y * gridmap.cell_size.z + gridmap.cell_size.z / 2.0
	)
	
	var particles = GPUParticles3D.new()
	particles.emitting = true
	particles.one_shot = true
	particles.amount = 12
	particles.lifetime = 0.6
	particles.explosiveness = 0.9
	
	var material = ParticleProcessMaterial.new()
	material.emission_shape = ParticleProcessMaterial.EMISSION_SHAPE_SPHERE
	material.emission_sphere_radius = 0.3
	material.direction = Vector3(0, 1, 0)
	material.spread = 180.0
	material.initial_velocity_min = 3.0
	material.initial_velocity_max = 5.0
	material.gravity = Vector3(0, -5.0, 0)
	material.scale_min = 0.05
	material.scale_max = 0.15
	
	var mesh = SphereMesh.new()
	mesh.radius = 0.2
	mesh.height = 0.4
	var spatial_mat = StandardMaterial3D.new()
	spatial_mat.albedo_color = Color(0.2, 1.0, 1.0) # Cyan/Blue for cleanser
	spatial_mat.emission_enabled = true
	spatial_mat.emission = Color(0.2, 1.0, 1.0)
	spatial_mat.emission_energy_multiplier = 3.0
	mesh.material = spatial_mat
	particles.draw_pass_1 = mesh
	
	particles.process_material = material
	particles.position = world_pos
	
	main_scene.add_child(particles)
	
	await get_tree().create_timer(1.2).timeout
	if particles and is_instance_valid(particles):
		particles.queue_free()